Chronotype reflects the morningness–eveningness preference over a 24 h period. Significant data indicate meaningful differences between evening types (ETs) and morning types (MTs) in behavior, personality traits, health, and well-being. This study explores the interactions between chronotype, sleep, personality, and life satisfaction among 254 undergraduate college students (mean age 23.79 ± 1.85). Using online questionnaires, the participants provided demographic information and completed assessments, including the Morningness–Eveningness Questionnaire (MEQ), the Pittsburg Sleep Quality Index (PSQI), a shortened version of the Big Five Inventory (BFI-10), and a life satisfaction uniscale measure. The results revealed a significant association between chronotype and both life satisfaction and sleep quality, where ETs exhibited poorer outcomes compared to MTs. Additionally, the chronotype correlated with agreeableness and conscientiousness, with later chronotypes linked to reduced scores in these personality traits. A key finding in this study was revealed in a mediation analysis in which sleep quality was found to mediate the relationship between chronotype and life satisfaction. The mediation analysis highlighted sleep quality as a crucial process connecting chronotype to life satisfaction. The findings emphasize the importance of addressing sleep quality in interventions aimed at enhancing life satisfaction and overall well-being among ETs. Overall, our results provide valuable insights into the intricate relationships between chronotype, personality, sleep quality, and subjective well-being.

Attention-Deficit Hyperactive Disorder (ADHD) is a widely spread phenomenon affecting learning abilities and performance. The aim of the research is to test the mechanism linking ADHD with statistics test performance. We found a significant indirect path linking the ADHD diagnosis and the final grade. ADHD was linked to lower self-efficacy, leading to a more negative attitude towards statistics and lower grades. While treating ADHD is beyond the ability of a course lecturer, its adverse consequences such as impaired performance, can be addressed in the classroom setting. Lecturers should be encouraged to take steps towards increasing the self-efficacy and positive perception of statistics of their students. This may help improve the performance of students with ADHD without having to directly treat the disorder.